47 replies to this topic

[Speedsterfromnorth]

Can you make an OBD log file?

 

1 log with only ignition on (to see correct MAP values; should be close to 100KPa atmospheric pressure)

1 log running engine (to see correct functioning of your O2 sensor and fuel trims) 

 

I have 123 Kpa when ignition on. 

 

I have a log file.

Attached Files

•  log not start 3.smp   57.93KB   3 downloads
•  log not start 2.smp   50.81KB   3 downloads

[Exmantaa]

123KPa means you have a HUGE high pressure system there, or you are well below sea level....

Check your MAP settings and sensor wiring!

[Exmantaa]

Should read 98-102KPa as atmospheric pressure

[Speedsterfromnorth]

Should read 98-102KPa as atmospheric pressure

 

Maybe I was wrong, don't remember what I read. 

[Speedsterfromnorth]

I have checked the wiring, and cannot find anything wrong. I see the plug is opposite numbering of the old 3 pin ? 

[Johnboyhgt]

Looking at the log you have 57kpa Map and -57 degrees air temperature.

 

Something is not right, could be a faulty sensor or the wiring is incorrect.

[Speedsterfromnorth]

Thx a lot for looking :-) 

 

I saw that and forgot to mention that i saw -40 as air temp. 

 

What can it be ? 

[smiley]

Here is a picture of a tmap conversion from the cobalt forums.

Maybe it helps.

 

 

[Exmantaa]

Yeah, I just looked into your logs with OBD and your MAP + IAT (intake temp) sensor wiring is wrong.

As Johnny already said your air temp is -57°C and you MAP reading climbs from 25-30 to 39-40KPa..

 

Something messed up in the TMAP sensor wiring.

(you should be able to measure the ground wires (should be connected to the engine = ground) and the +5v reference voltage wire)

[Speedsterfromnorth]

Measure now.

Ground is Ok. On pin 1 on the plug.
Pin 2 should be iAT. But still shows -40
Pin 3 measure 5v white/black from old map sensor
Pin 4 should be green from old map sensor.

Tmap sensor is new.

[Speedsterfromnorth]

I SAW from an Cheap obd Scanner i have that short term fuel is 99%. Is that why I Get all the fuel Maybe?

[smiley]

If you are 100% sure about the wiring, then the only thing i can think of is a duff tmap.

Cause this is not normal output.

 

Edited by smiley, 11 April 2019 - 03:05 PM.

[Exmantaa]

Forget the map, your sensors give the wrong values becausr the wiring is messed up...

[Exmantaa]

Easy way to check the pin order, if you disconnect pin 2, only the intake temp reading should change to max value

[Exmantaa]

http://www.vx220.org...-sensor-wiring/

[gertje]

Yes, that why i asked what map sensor you have. Wrong wiring or bad mapsensor

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[Speedsterfromnorth]

I checked once more know with logging on and i get different readings when bending on the plug. When all the way in both pressure and temp is wrong. I can manage to get both right with adjusting/bending on the plug. I did cut it and reconnected it earlier today. I also used a little of WD40 it now without any difference. 

[smiley]

What plug did you use?
An old postcat lambda plug should also fit in case you want to fiddle.

Edited by smiley, 11 April 2019 - 05:47 PM.

[Speedsterfromnorth]

What plug did you use?
An old postcat lambda plug should also fit in case you want to fiddle.

Bought new bosch plug 

[Speedsterfromnorth]

I now pushed the plug all the way in til IT clicked and then dragged IT back avsindig the lock. Then i got the correct value and started.
I was going up and down on rpm But at last settled pretty Good But is still running very Rich.
I suddently SAW that the exhaust manifold was getting a little red so i did cut.